The use of an 'undercut' pole (resulting in a ' T ' shape)
results in near-perfect symmetry of the magnetic flux profile in and out of the gap.

Key:Straight pole / no Faraday ring, T-pole + lower ring, T-pole + both rings

For 1W input the Ultra Low Distortion Motor System gives up to 20dB
reduction in second harmonic distortion and up to 10dB reduction in third harmonic distortion.

Key: Straight pole / no Faraday ring, T-pole / no Faraday ring - 10dB increments of input power